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switch from PRNG to random module

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flywind
2020-12-01 19:28:51 +08:00
parent 2e4b6b94e6
commit 83b4d8946d
1 changed files with 13 additions and 13 deletions
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26
lib/pure/oids.nim
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@@ -12,24 +12,24 @@
## produce a globally distributed unique ID. This implementation was extracted
## from the Mongodb interface and it thus binary compatible with a Mongo OID.
##
## This implementation calls ``math.randomize()`` for the first call of
## This implementation calls `random.randomize()` for the first call of
## ``genOid``.
import hashes, times, endians
import hashes, times, endians, random
type
Oid* = object ## an OID
Oid* = object ## An OID.
time: int32 ##
fuzz: int32 ##
count: int32 ##
proc `==`*(oid1: Oid, oid2: Oid): bool =
## Compare two Mongo Object IDs for equality
## Compares two Mongo Object IDs for equality.
return (oid1.time == oid2.time) and (oid1.fuzz == oid2.fuzz) and
(oid1.count == oid2.count)
proc hash*(oid: Oid): Hash =
## Generate hash of Oid for use in hashtables
## Generates hash of Oid for use in hashtables.
var h: Hash = 0
h = h !& hash(oid.time)
h = h !& hash(oid.fuzz)
@@ -44,7 +44,7 @@ proc hexbyte*(hex: char): int =
else: discard
proc parseOid*(str: cstring): Oid =
## parses an OID.
## Parses an OID.
var bytes = cast[cstring](addr(result.time))
var i = 0
while i < 12:
@@ -52,6 +52,7 @@ proc parseOid*(str: cstring): Oid =
inc(i)
proc oidToString*(oid: Oid, str: cstring) =
## Converts a oid to `str`.
const hex = "0123456789abcdef"
# work around a compiler bug:
var str = str
@@ -66,21 +67,20 @@ proc oidToString*(oid: Oid, str: cstring) =
str[24] = '\0'
proc `$`*(oid: Oid): string =
## Converts a oid to string.
result = newString(24)
oidToString(oid, result)
proc rand(): cint {.importc: "rand", header: "<stdlib.h>", nodecl.}
proc srand(seed: cint) {.importc: "srand", header: "<stdlib.h>", nodecl.}
var t = getTime().toUnix.int32
srand(t)
randomize(t)
var
incr: int = rand()
fuzz: int32 = rand()
incr: int = rand(0x7fff)
fuzz = int32(rand(high(int32)))
proc genOid*(): Oid =
## generates a new OID.
## Generates a new OID.
t = getTime().toUnix.int32
var i = int32(atomicInc(incr))
@@ -89,7 +89,7 @@ proc genOid*(): Oid =
bigEndian32(addr result.count, addr(i))
proc generatedTime*(oid: Oid): Time =
## returns the generated timestamp of the OID.
## Returns the generated timestamp of the OID.
var tmp: int32
var dummy = oid.time
bigEndian32(addr(tmp), addr(dummy))